Question: which aircraft family has the lowest highest glide ration whose instance of is aircraft family?
Paraphrase: What are the aircraft families with the lowest and highest glide ration?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q15056993 . ?ent wdt:P1470 ?obj . ?ent wdt:P31 wd:Q15056993} ORDER BY ASC(?obj)LIMIT 5 
Answer: SZD-50 Puchacz, Grob G102 Astir, Rolladen-Schneider LS4, G104 Speed Astir, ASW 20